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Soccer players in the 80s and before had really short shorts, today they reach down to the knees. I think it's also that it's been made such that even seeing thighs is now considered sexualized even on men.

But Japan has a different tradition on this, showing tits is forbidden but legs are not considered sexual. 
> pic
You wouldn't see westerners do this unless it was a gay parade. Anime is Japanese.